Facebook's Mark Zuckerberg appears to get grumpy with a ref - after losing a jiu-jitsu bout.
The Meta CEO was filmed fighting an unknown competitor in Redwood City in California on Saturday (6/5).
Video shows the Facebook founder attempting to pin his opponent before getting pinned to the floor himself.
Eventually the ref calls the match and gives the win to his opponent - believing that Zuckerberg, 38, had 'tapped out'.
Onlookers say the confused and shocked billionaire is seen to be furious claiming it was an error - and the match is eventually re-cast as a 0-0 draw.
The 'controversial' call seems to satisfy Zuckerberg in the footage, who hugs his opponent.
Zuckerberg later won gold and silver medals at the event - his first public competition.
It was revealed in September last year that he had taken up mixed martial arts (MMA), with his trainer has describing him as a "silent killer" in the ring."
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